Pattern for casting pipe



June 30, 1925. 1,544,661

D. B. DIMICK PATTERN FOR CASTING PIPE Original Filed 31, 1924IlV/AIlllllllll||l llll|llll%1% llllllllllllll. IIIIIIHIM amel 171ml; 39armwdlw Patented June 30, 1925.

UNITED STATES DANIEL BAKER DIMICK, OF BIRMINGHAM, ALABAMA.

PATTERN FOR CASTING PIPE.

Original application filed. January 31, 1924, Serial No. 689,810.Divided and this application filed.

' September 26, 1924. Serial No. 740,096.

To all whom it may concern:

Be it known that I, DANIEL BAKEK DIMICK, a citizen of the United States,residing at Birmingham, in the county of Jefferson and State of Alabama,have invented certain new and us'eful Improvements in Patterns forCasting Pipe; and I do hereby declare the following to be a full, clear,and

exact description of the invention, such as will enable others skilledin the art to which it appertainsto make and use the same.

The present invention relates to improvements inpatterns for castingpipe and this application is a division of my copending case Serial No.689,810, filed January 31, 1924, entitled Apparatus for casting pipe.

The object of the invention is to provide an improved pattern having aflexible connection with the machine for screwing it out of the sand andprovided with means to rough the sand in order that the molten metalwill lie thereagainst. Y

.WVith the foregoing andother objects in view, the invention will bemore fully described hereinafter, and will be more particularly pointedout in the claims appended hereto.

In the drawings, wherein like symbols refer to like or correspondingparts throughout the several views, I

Figure 1 is a side elevation, on an enlarged scale, of the pattern anddriving head.

Figure 2 is a longitudinal section taken through the parts shown inFigure 1.

Figure 3 is a bottom plan view of the driving head.

Figure 4c is a cross section taken on the line H in Figure 2, and

Figure 5 is an enlarged fragmentary section taken through that portionof the pat tern which contains the roughing pins.

The pattern is provided with a thickened collar portion 20, adapted tofit rather loosely within the inner and outer annular flanges or rings21 and 22 upon the lower part of the driving head 12. The rings 21 and22 of the driving head are reinforced at proper points, and at thesepoints are made registering perforations 23 for receiving the pins 24,the pins passing in through the perforations in both the rings 21 and 22and alining perforations in the pattern collar 20. Preferably, only twopins at diametrically opposite points are inserted, and as aforesaid,

there is a certain looseness in the fit of the collar within the rings.This secures the very desirable result of permitting the pattern 11 toadjust itself to a correct position with respect to the mold {and thesand therein, and the mold will be unaffected by any variations inmovement of the driving head or the shaft 9. In this manner, a truermold cavity is produced.

Now referring more particularly to Fig-- ures 2, 4: and 5, numerous pinsor small steel picks 25areshown as fitted through appropriate openingsmade in the wall of the pattern 11 and projecting beyond the interiorwall thereof, where the same are sharpened. These pins or picks arepreferably arranged in off-set or staggered relation, and they areplaced at only a small cylindrical section of the pattern 11, preferablya short distance up from the base of the pattern. The function of thesepins is to rough the slick or polished sand.

In the operation of the device, the sand slinger is caused to throw inthe sand to the mold about the pattern during the rotation of thepattern on the casting table, which table preferably rotates on ballbearings and is very true. The table turns at the rate of approximatelyeight revolutions per minute. The compactness of the'ram can beregulated inthree ways, namely, speed of the revolving table, speed ofthe sand slinger motor, and rate of feed of sand into the hopper of thesand slinging machine. It requires about two minutes to throw the sandinto the mold to complete the operation. The entire operation ismechanical and a perfect ram on all parts of the corrugations or threadsis obtained.

The pattern is then screwed upwardly and out of the sand, being drivenby the pins 24; of the head 12, the connection being a flexible one asheretofore described. During this movement of the pattern, the pins 25will rough up the polish and slick sand, without, however, materiallydisturbing this sand, and the lower section of the pattern will tend topress back this roughed sand, but it will not slick or polish it.

After the pattern is withdrawn, the molten metal is poured into themold, and a relatively thin walled continuously cylindrical corrugatedcast pipe is produced, all in a single operation without any joints.

It will be noted that the spiral corrugabe called a duplex action is hadupon the sand in the mold v The pattern is machined in such a Way thatthere is an even thick ness of metal throughout; therefore whencontinuously cylindrical spirally corrugated the pattern is screwedupward and out of themoldyit't'orms, through this duplex action,simultaneously a spiral corrugated mold in the outer member, and aspirally corrugated mold: on the inner member? Thus there is produced bya single operation a mold cavity. having spirally corrugated int81'101"i111l EXtBI'lOI" walls for" producing 111 one "castingI'operation' aspirallycorrugated ipe havingthe corrugations upon bothinside and outside surfaces: The pattern thus (l1I f6I'S"'fIOl11those-cases in" which a screW produced a thread upon onesurface ot'thesand only. i

It is obvious" that various changes? and modifications may i be made-inthe' 'details o t' constructioni and design of" the above specifi'cally:described" embodiment of this inyention' Without departing: fromthespirit thereof. such changes and modifications he-'1 mrestrictedonlyt-by the scope of the fol in lowing iclainis;

What is claimed is lLInan apparatus' tor casting pipe; a

patterii havingacontinuously cylindrical spirally corrugated Wall forscrewing axial= ly out of the' sand cavity in a mold; said pattern"having means for roughingqthesand during' its movement therethroughi p2. 111 la-apparatus for castingaplpe; a:

pattern having: a continuously cylindrical spirally corrugated: Wall for"screwing axial ly out of the-sand cavity: in a mold,and numerousrelatively r ofi-set pins projecting inwardly; from the pattern 'at onecylindriadaptedto"pressbackthe roughed sand.

3. A pattern for'cast metal pipe having a Wall for serewing out-of-thesand cayity in a mold whereby to produce a seamless cast metal pipe.

4:. In an apparatuswfor casting pipe a pattern having fa continuouslycylindrical spirally corrugated wall externally and ternally torscrewingaxially-out of thesand cavity in a 'mold, said patternhayi'nguneane for roughmg: the sand (lIlI'lI'lg: its movementtherethroughfi 5.: In ail/apparatus ton casting/ pipe? :1

pattern havinga continuously cylindrical spirally-corrugatedwallfexternallyf and internally for screwing axially outof the sandcavity; in a mold; the outer threa-d or spiral corrugation is insteporiin-p-iteh-with the;

inner spiral or threaded corrugation, and

numerous relatively oil-set pins projecting inwardly from the pattern-atone-cylindrig adapted to'press backthe roughed Sandi 6. A patternforqcastmetal pipdhalving an out-er and inner continuously cylindricalspirallycorrugated Wall in which the outer thread or spiral 'corrugationis in-step or in p'ith with the inner" spiral or-threaded cor rugationfor screwing out of the sand cavity.

in! a mold whereby toproduele in {one operation a seamless castmetalplpe.

'DA-NIEIJ BAKER niMioie

